SHAREHOLDERS' EQUITY, EXERCISE PRICE RANGE AND TREASURY STOCK (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) Transaction $ / shares shares	Dec. 31, 2015 USD ($) Transaction shares	Dec. 31, 2014 USD ($) Transaction $ / shares shares
Equity, Class of Treasury Stock [Line Items]
Number of separate transactions | Transaction	5	0	2
Shares repurchased (in shares) | shares	845	0	400
Cost of shares retired | $	$ 8,900	$ 0	$ 6,300
Remaining authorized repurchase amount | $	$ 876,000
Minimum [Member]
Equity, Class of Treasury Stock [Line Items]
Average cost per share (in dollars per share)	$ 10.00		$ 15.38
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Average cost per share (in dollars per share)	10.01		$ 15.49
Range 8.74 to 10.93 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	8.74
Exercise price range, upper range limit (in dollars per share)	$ 10.93
Number of options outstanding, ending balance (in shares) | shares	67,000
Options outstanding, weighted average remaining contractual life	6 years
Options outstanding, weighted average exercise price (in dollars per share)	$ 10.04
Options exercisable, number of options exercisable at end of period (in shares) | shares	0
Options exercisable, weighted average exercise price (in dollars per share)	$ 0
Range 10.93 to 13.11 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	10.93
Exercise price range, upper range limit (in dollars per share)	$ 13.11
Number of options outstanding, ending balance (in shares) | shares	60,000
Options outstanding, weighted average remaining contractual life	5 years
Options outstanding, weighted average exercise price (in dollars per share)	$ 12.45
Options exercisable, number of options exercisable at end of period (in shares) | shares	37,333
Options exercisable, weighted average exercise price (in dollars per share)	$ 12.55
Range 15.30 to 17.48 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	15.30
Exercise price range, upper range limit (in dollars per share)	$ 17.48
Number of options outstanding, ending balance (in shares) | shares	141,000
Options outstanding, weighted average remaining contractual life	4 years
Options outstanding, weighted average exercise price (in dollars per share)	$ 16.16
Options exercisable, number of options exercisable at end of period (in shares) | shares	108,999
Options exercisable, weighted average exercise price (in dollars per share)	$ 16.28
Range 17.49 to 19.66 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	17.49
Exercise price range, upper range limit (in dollars per share)	$ 19.66
Number of options outstanding, ending balance (in shares) | shares	121,000
Options outstanding, weighted average remaining contractual life	2 years 7 months 6 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 18.26
Options exercisable, number of options exercisable at end of period (in shares) | shares	115,417
Options exercisable, weighted average exercise price (in dollars per share)	$ 18.29
Range 19.67 to 21.85 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	19.67
Exercise price range, upper range limit (in dollars per share)	$ 21.85
Number of options outstanding, ending balance (in shares) | shares	76,666
Options outstanding, weighted average remaining contractual life	1 year 3 months 18 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 19.75
Options exercisable, number of options exercisable at end of period (in shares) | shares	76,666
Options exercisable, weighted average exercise price (in dollars per share)	$ 19.75
Range 10.93 to 21.85 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	10.93
Exercise price range, upper range limit (in dollars per share)	$ 21.85
Number of options outstanding, ending balance (in shares) | shares	465,666
Options outstanding, weighted average remaining contractual life	3 years 7 months 6 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 15.94
Options exercisable, number of options exercisable at end of period (in shares) | shares	338,415
Options exercisable, weighted average exercise price (in dollars per share)	$ 17.34